With this perk, you will find considerably more bottle caps in containers than you normally would. Technically, it gives a 10% chance (CapsFortuneFinder global is assigned from 100 to 90) to get either 110-190 or 20-80 extra bottle caps in containers, depending if container uses CapsChangeFortuneFinder (player level based, former range) or CapsFortuneFinder (random, later range) leveled lists.